HI, I am having problems trying to diagnose what is wrong with my 1 year old black rock. She has a choking type spasm which seems to stop her in her tracks, she is constantly shaking her head like trying to shake something free from her mouth, I have just wormed them all with Flubenvet and they have A.C.V and Verm-X once a month. They are totally free ranging in orchards. She is eating normally and laying every day and is looking healthy apart from the symptoms I have described. She has no discharge from her nose or eyes and sinuses look good, and her droppings are o.k. I wondered if it could be Gapeworm even though I have just wormed them? I would be most grateful for any advice.